%0 Journal Article %A Zsolt Páles %T A Hahn-Banach theorem for separation of semigroups and its application. %J Aequationes mathematicae %D 1989 %P 141-161 %V 37 %N 2-3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1989__37_2-3_137297/ %F AM2_1989__37_2-3_137297